Is it necessary to kill the minibosses to access the First Dragon or is it possible just buying the 4 access items and using?

Question

I wonder if the minibosses really are necessary killing or if I can just start the quest and then buy their 4 respective drops (Horn of Kalyassa, Bones of Zorvorax, Scale of Gelidrazah, Tooth of Tazhadur ) to gain access to the first dragon.

Answer 1

Unfortunately, you have to kill all 4 bosses personally, this is a verified piece of information (unless something has changed in those 2-3 years since I did it) because I was unable to kill the boss in zao, I bought the item and was unable to use it on the wall to proceed.